The effective atomic numbers of some biomolecules calculated by two methods: A comparative study

被引：42

作者：

Manohara, S. R. ^{[1
]}

Hanagodimath, S. M. ^{[1
]}

Gerward, L. ^{[2
]}

机构：

[1] Gulbarga Univ, Dept Phys, Gulbarga 585106, Karnataka, India

[2] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark

来源：

MEDICAL PHYSICS | 2009年 / 36卷 / 01期

关键词：

effective atomic number; mass attenuation coefficient; photon interaction cross section; fatty acids; amino acids; medical imaging; radiation therapy; absorbed dose; BIOLOGICALLY IMPORTANT COMPOUNDS; RAY ATTENUATION COEFFICIENTS; PHOTON ENERGY-ABSORPTION; ESSENTIAL AMINO-ACIDS; RANGE; KEV; ELECTRON-DENSITIES; CROSS-SECTIONS; HUMAN-TISSUES; FATTY-ACIDS;

D O I：

10.1118/1.3030952

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

The effective atomic numbers Z(eff) of some fatty acids and amino acids have been calculated by two numerical methods, a direct method and an interpolation method, in the energy range of 1 keV-20 MeV. The notion of Z(eff) is given a new meaning by using a modern database of photon interaction cross sections (WinXCom). The results of the two methods are compared and discussed. It is shown that for all biomolecules the direct method gives larger values of Z(eff) than the interpolation method, in particular at low energies (1-100 keV) At medium energies (0.1-5 MeV), Z(eff) for both methods is about constant and equal to the mean atomic number of the material. Wherever possible, the calculated values of Z(eff) are compared with experimental data. (C) 2009 American Association of Physicists in Medicine. [DOI: 10.1118/1.3030952]

引用

页码：137 / 141

页数：5

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